internal static IList <XSharpToken> GetTokensUnderCursor(XSharpSearchLocation location, out CompletionState state)
{
var tokens = GetTokenList(location, out state, true, true).Where((t) => t.Channel == XSharpLexer.DefaultTokenChannel).ToList();
// Find "current" token
if (tokens.Count > 0)
{
var tokenUnderCursor = tokens.Count - 1;
for (int i = tokens.Count - 1; i >= 0; i--)
{
var token = tokens[i];
if (token.StartIndex <= location.Position && token.StopIndex >= location.Position)
{
tokenUnderCursor = i;
break;
}
}
var selectedToken = tokens[tokenUnderCursor];
var nextToken = tokenUnderCursor < tokens.Count - 1 ? tokens[tokenUnderCursor + 1] : null;
bool done = false;
switch (selectedToken.Type)
{
case XSharpLexer.NAMEOF:
case XSharpLexer.TYPEOF:
case XSharpLexer.SIZEOF:
case XSharpLexer.SELF:
case XSharpLexer.SUPER:
if (nextToken != null && nextToken.Type == XSharpLexer.LPAREN)
{
return(tokens);
}
break;
default:
if (XSharpLexer.IsKeyword(selectedToken.Type))
{
tokens.Clear();
tokens.Add(selectedToken);
return(tokens);
}
break;
}
// When we are not on a Keyword then we need to walk back in the tokenlist to see
// if we can evaluate the expression
// This could be:
// System.String.Compare() // static method cal or method call
// SomeVar:MethodCall() // method call
// Left(...) // function call
// SomeId // local, global etc
// SomeType.Id // Static property or normal property
// SomeVar:Id // Instance field or property
// If the token list contains with a RCURLY, RBRKT or RPAREN
// Then strip everything until the matching LCURLY, LBRKT or LPAREN is found
var list = new XSharpTokenList(tokens);
tokens = new List <XSharpToken>();
while (!list.Eoi())
{
var token = list.ConsumeAndGet();
switch (token.Type)
{
case XSharpLexer.LCURLY:
tokens.Add(token);
if (list.Contains(XSharpLexer.RCURLY))
{
// this may return false when the RCURLY belongs to another LCURLY
if (list.ConsumeUntilEndToken(XSharpLexer.RCURLY, out var endToken))
{
tokens.Add(endToken);
}
}
break;
case XSharpLexer.LPAREN:
tokens.Add(token);
if (list.Contains(XSharpLexer.RPAREN))
{
// this may return false when the RPAREN belongs to another LPAREN
if (list.ConsumeUntilEndToken(XSharpLexer.RPAREN, out var endToken))
{
tokens.Add(endToken);
}
}
break;
case XSharpLexer.LBRKT:
tokens.Add(token);
if (list.Contains(XSharpLexer.RBRKT))
{
// this may return false when the RBRKT belongs to another LBRKT
if (list.ConsumeUntilEndToken(XSharpLexer.RBRKT, out var endToken))
{
tokens.Add(endToken);
}
}
break;
case XSharpLexer.DOT:
case XSharpLexer.COLON:
case XSharpLexer.SELF:
case XSharpLexer.SUPER:
tokens.Add(token);
break;
default:
tokens.Add(token);
if (XSharpLexer.IsOperator(token.Type))
{
done = true;
}
if (token.Type == XSharpLexer.VAR)
{
done = true;
}
else if (XSharpLexer.IsKeyword(token.Type) &&
!XSharpLexer.IsPositionalKeyword(token.Type)
)
{
done = true;
}
break;
}
}
// now result has the list of tokens starting with the cursor
// we only keep:
// ID, DOT, COLON, LPAREN, LBRKT, RBRKT
// when we detect another token we truncate the list there
if (tokens.Count > 0)
{
var lastType = tokens[0].Type;
for (int i = tokenUnderCursor + 1; i < tokens.Count && !done; i++)
{
var token = tokens[i];
switch (token.Type)
{
case XSharpLexer.ID:
case XSharpLexer.DOT:
case XSharpLexer.COLON:
case XSharpLexer.LPAREN:
case XSharpLexer.LCURLY:
case XSharpLexer.LBRKT:
lastType = tokens[i].Type;
break;
case XSharpLexer.LT:
int gtPos = findTokenInList(tokens, i + 1, XSharpLexer.GT);
if (lastType == XSharpLexer.ID && gtPos > 0)
{
gtPos += 1;
tokens.RemoveRange(gtPos, tokens.Count - gtPos);
done = true;
break;
}
else
{
goto default;
}
default:
tokens.RemoveRange(i, tokens.Count - i);
done = true;
break;
}
}
}
}
// check for extra lparen, lcurly at the end
int count = tokens.Count;
if (count > 2 && count < tokens.Count - 2)
{
if (tokens[count - 2].Type == XSharpLexer.LPAREN)
{
switch (tokens[count - 1].Type)
{
case XSharpLexer.LPAREN:
case XSharpLexer.LCURLY:
tokens.RemoveAt(count - 1);
break;
}
}
}
return(tokens);
}
